Comment by deltoidmaximus
2 days ago
I think these products were always niche for the reasons parent suggested, I recall their price and max capacity being unappealing when I was looking to make use of a drawer full of obsolete RAM. But since there were several iterations from a few companies they must have sold well enough to justify their development.
They seemed to stop making them altogether around when SSDs came out which probably shrunk the market niche right out of viability.
I think SSDs are the answer here. You'll get more space out of a several generation old SSD, and you still stuck to the PCI speeds so performance isn't going to be much different vs a card with DDR2 or 3 on it. (performance estimates are guess-timization, not calculations)